metamorphic

Likely serpentine-rich greenstone

Serpentine-group minerals, chiefly antigorite/lizardite; possibly chlorite- or epidote-bearing altered ultramafic rock

AI-generated identification · may be incorrect

Green-gray, mottled, dull to slightly waxy luster, irregular granular texture, and no visible cleavage; serpentine has Mohs hardness about 2.5–4 and density roughly 2.5–2.6. The small, weathered specimen is insufficient for a definitive mineral identification.

Identified September 16, 2026More metamorphic →

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At a glance

Common name: Likely serpentine-rich greenstone
Scientific name: Serpentine-group minerals, chiefly antigorite/lizardite; possibly chlorite- or epidote-bearing altered ultramafic rock
Category: metamorphic
Identified: September 16, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small common specimen; attractive polished or unusually patterned pieces may sell for $20–$100.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Forms when olivine- and pyroxene-rich mantle rocks are hydrated during low-temperature metamorphism, commonly along faults and subduction zones. Serpentinization occurs from the Precambrian to the present, rather than representing one specific age.

Uses & applications

Common serpentine is used decoratively, for carvings and ornamental stone; historically, some varieties were used in construction, though asbestos-bearing material requires caution. A small ordinary specimen generally has little commercial value.

Geological facts

Serpentine often has a greasy or waxy feel and may show fibrous veins. It can be confused with jade, but jade is considerably harder and tougher.

Field identification & locations

Common in California, the Italian Alps, New Zealand, Canada, and ophiolite belts worldwide. Check for a waxy feel, low hardness, pale green streak or powder, and reaction behavior; laboratory testing is needed because the image cannot rule out chlorite, epidote, or greenstone.